Universal behaviour in the floating up of quantum Hall extended states as B -> 0
Mesoscale and Nanoscale Physics
2007-05-23 v2 Strongly Correlated Electrons
Abstract
We investigate the relationship between the quantum Hall extended states and the apparent B=0 `metal'-insulator transition in extremely low density, high quality two-dimensional n-GaAs systems (\mu_{peak} ~ 2 x 10^7 cm^2/Vs). The combination of small effective mass and high quality allow us to resolve the continued floating up in energy of the extended states down to very low magnetic fields, B=0.015T, despite an apparent `metal'-insulator transition at B = 0. We present a modified global phase diagram which brings together conflicting data in the literature from different material systems, and reconciles the differences as to the fate of the extended states as B -> 0.
Cite
@article{arxiv.cond-mat/0204519,
title = {Universal behaviour in the floating up of quantum Hall extended states as B -> 0},
author = {C. E. Yasin and M. Y. Simmons and A. R. Hamilton and N. E. Lumpkin and R. G. Clark and L. N. Pfeiffer and K. W. West},
journal= {arXiv preprint arXiv:cond-mat/0204519},
year = {2007}
}
Comments
5 pages, 4 figures